Techniques for forming burst cutting area mark

Abstract

A BCA mark is applied prior to molding of optical recording media. A stamper including a BCA code is formed. The stamper including the BCA code is used in the molding of optical recording discs. This technique can be used in manufacturing of read-only type discs, recordable discs, rewritable discs, hybrid discs, discs readable from both disc sides, discs having multiple information layers, high-density discs, etc.

What is claimed is: 
     
       1. A method for applying data to a burst cutting area (BCA) prior to molding of optical recording media, said method comprising:
 forming a stamper including BCA data thereon; and 
 using the stamper including the BCA data in the molding of optical recording discs to form optical recording discs including a BCA mark thereon, 
 wherein the BCA data is applied by a laser to one of a father or a mother, 
 where the stamper is formed using the mother, and the mother is formed using the father and the father is formed using a mastering substrate. 
 
     
     
       2. The method of  claim 1 , wherein the BCA data is applied to the father, and the father including the BCA data is used in a process for forming the stamper. 
     
     
       3. The method of  claim 1 , wherein the BCA data is applied to the mother, and the mother including the BCA data is used in a process for forming the stamper. 
     
     
       4. The method of  claim 1 , further comprising the step of covering an information layer and the BCA mark of the optical recording discs with a reflective layer. 
     
     
       5. The method of  claim 1 , wherein the BCA mark applied to the stamper has physical parameters that accommodate contrast and shrinkage in the molded optical recording discs. 
     
     
       6. The method of  claim 1 , wherein the BCA data is applied by the laser in a non-continuous spiral mode that is timed with a pulse per revolution signal according to the BCA data.